update docs

packages/artplayer-vitepress/docs/en/library/flv.md

@@ -0,0 +1,37 @@
+# flv.js
+
+👉 [https://github.com/Bilibili/flv.js](https://github.com/Bilibili/flv.js)
+
+<div className="run-code" data-libs="https://cdnjs.cloudflare.com/ajax/libs/flv.js/1.6.2/flv.min.js">
+    ▶ Run Code
+</div>
+
+```js{19-22,26}
+function playFlv(video, url, art) {
+    if (flvjs.isSupported()) {
+        const flv = flvjs.createPlayer({ type: 'flv', url });
+        flv.attachMediaElement(video);
+        flv.load();
+
+        // optional
+        art.flv = flv; 
+        art.once('url', () => flv.destroy());
+        art.once('destroy', () => flv.destroy());
+    } else {
+        art.notice.show = 'Unsupported playback format: flv';
+    }
+}
+
+var art = new Artplayer({
+    container: '.artplayer-app',
+    url: '/assets/sample/video.flv',
+    type: 'flv',
+    customType: {
+        flv: playFlv,
+    },
+});
+
+art.on('ready', () => {
+    console.info(art.flv);
+});
+```